This isn't for a psu, it's for a scanner. A friend of mine blew out his converter and wants a replacement. His old one was 12volts rated at 1200milli amps. I have a 12volts one rated at 4amps, i know there's enough power there but it won't put out a constant 4amps it will give out whatever the scanner pulls from it right? If it didn't it would state continous power or something on the adapter somewhere. Thanks,